Relates to the manufacture and use of fertilizers, nutrients, soil amendments, growth and plant physiology regulators, plant resistance improvers, compost and soil improvers, propagative materials for growing plants, certain agricultural support products, plant nutrients, trace elements, nutritional chemicals, plant inoculants, etc. (Source: Faolex)

Substance added to soil for the purpose of promoting plant life, usually containing nitrogen, potassium and phosphorus, e.g. manure, guano, rock phosphates. (Source: GEMET/BENNET)